<s>
Virtual	B-Application
PC	I-Application
is	O
an	O
x86	B-Operating_System
emulator	B-Application
for	O
PowerPC	B-Architecture
Mac	B-Device
hosts	O
and	O
a	O
virtualization	B-General_Concept
app	O
for	O
Microsoft	B-Application
Windows	I-Application
hosts	O
.	O
</s>
<s>
The	O
Mac	B-Device
version	O
was	O
discontinued	O
in	O
2006	O
following	O
the	O
Mac	B-Device
transition	I-Device
to	I-Device
Intel	I-Device
,	O
while	O
the	O
Windows	O
version	O
was	O
discontinued	O
in	O
2011	O
in	O
favour	O
of	O
Hyper-V	O
.	O
</s>
<s>
Until	O
version	O
4	O
,	O
Virtual	B-Application
PC	I-Application
only	O
supported	O
Classic	B-Application
Mac	I-Application
OS	I-Application
hosts	O
.	O
</s>
<s>
Version	O
4	O
was	O
released	O
in	O
2000	O
for	O
both	O
Mac	B-Application
OS	I-Application
and	O
Windows	O
,	O
and	O
version	O
5	O
(	O
2001	O
)	O
added	O
support	O
for	O
Mac	B-Application
OS	I-Application
X	I-Application
hosts	O
.	O
</s>
<s>
After	O
Microsoft	O
acquired	O
Virtual	B-Application
PC	I-Application
from	O
Connectix	O
in	O
2003	O
,	O
the	O
program	O
was	O
renamed	O
Microsoft	B-Application
Virtual	I-Application
PC	I-Application
.	O
</s>
<s>
In	O
August	O
2006	O
,	O
Microsoft	O
announced	O
the	O
Mac	B-Device
version	O
would	O
not	O
be	O
ported	O
to	O
Intel-based	B-Device
Macs	I-Device
,	O
effectively	O
discontinuing	O
the	O
product	O
as	O
PowerPC-based	O
Macs	B-Device
would	O
no	O
longer	O
be	O
manufactured	O
.	O
</s>
<s>
In	O
2009	O
,	O
Microsoft	O
released	O
Windows	B-Application
Virtual	I-Application
PC	I-Application
,	O
which	O
is	O
only	O
compatible	O
with	O
Windows	B-Device
7	I-Device
hosts	O
,	O
and	O
is	O
the	O
technical	O
foundation	O
for	O
the	O
latter	O
's	O
Windows	B-Application
XP	I-Application
Mode	O
.	O
</s>
<s>
Windows	B-Application
Virtual	I-Application
PC	I-Application
does	O
not	O
officially	O
support	O
MS-DOS	O
or	O
operating	O
systems	O
older	O
than	O
Windows	B-Application
XP	I-Application
Professional	I-Application
SP3	I-Application
as	O
guests	O
.	O
</s>
<s>
Connectix	B-Application
Virtual	I-Application
PC	I-Application
,	O
Microsoft	B-Application
Virtual	I-Application
PC	I-Application
2004	O
,	O
Microsoft	B-Application
Virtual	I-Application
PC	I-Application
2007	O
,	O
and	O
Windows	B-Application
Virtual	I-Application
PC	I-Application
are	O
successive	O
versions	O
of	O
the	O
same	O
software	O
.	O
</s>
<s>
Windows	B-Application
Virtual	I-Application
PC	I-Application
only	O
runs	O
on	O
Windows	B-Device
7	I-Device
.	O
</s>
<s>
The	O
earlier	O
Microsoft	O
versions	O
which	O
run	O
on	O
older	O
versions	O
of	O
Windows	O
are	O
still	O
available	O
and	O
support	O
operating	O
systems	O
older	O
than	O
Windows	B-Application
XP	I-Application
.	O
</s>
<s>
Starting	O
in	O
Windows	B-Application
8	I-Application
,	O
Microsoft	O
replaced	O
Virtual	B-Application
PC	I-Application
with	O
Hyper-V	O
.	O
</s>
<s>
Virtual	B-Application
PC	I-Application
was	O
originally	O
developed	O
as	O
a	O
Macintosh	B-Device
application	O
for	O
System	O
7.5	O
and	O
released	O
by	O
Connectix	O
in	O
June	O
1997	O
.	O
</s>
<s>
The	O
first	O
version	O
of	O
Virtual	B-Application
PC	I-Application
designed	O
for	O
Windows-based	O
systems	O
,	O
version	O
4.0	O
,	O
was	O
released	O
in	O
June	O
2001	O
.	O
</s>
<s>
Connectix	O
sold	O
versions	O
of	O
Virtual	B-Application
PC	I-Application
bundled	O
with	O
a	O
variety	O
of	O
guest	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
,	O
including	O
Windows	O
,	O
OS/2	B-Application
,	O
and	O
Red	O
Hat	O
Linux	B-Application
.	O
</s>
<s>
As	O
virtualization	B-General_Concept
's	O
importance	O
to	O
enterprise	O
users	O
became	O
clear	O
,	O
Microsoft	O
took	O
interest	O
in	O
the	O
sector	O
and	O
acquired	O
Virtual	B-Application
PC	I-Application
and	O
Virtual	B-General_Concept
Server	I-General_Concept
(	O
unreleased	O
at	O
the	O
time	O
)	O
from	O
Connectix	O
in	O
February	O
2003	O
.	O
</s>
<s>
Virtual	B-Application
PC	I-Application
4	O
requires	O
Mac	B-Application
OS	I-Application
8.5	O
or	O
later	O
on	O
a	O
G3	O
or	O
G4	O
processor	B-Device
,	O
but	O
running	O
Windows	B-Device
Me	I-Device
,	O
Windows	B-Application
2000	I-Application
or	O
Red	O
Hat	O
Linux	B-Application
requires	O
Mac	B-Operating_System
OS	I-Operating_System
9.0	I-Operating_System
or	O
later	O
.	O
</s>
<s>
Virtual	B-Application
PC	I-Application
4	O
was	O
the	O
first	O
version	O
with	O
expandable	O
drive	B-Application
images	I-Application
.	O
</s>
<s>
Virtual	B-Application
PC	I-Application
5	O
requires	O
Mac	B-Operating_System
OS	I-Operating_System
9.1	I-Operating_System
or	O
newer	O
or	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
10.1	I-Operating_System
or	O
later	O
.	O
</s>
<s>
For	O
USB	O
support	O
,	O
Mac	B-Application
OS	I-Application
X	I-Application
is	O
recommended	O
.	O
</s>
<s>
To	O
run	O
Virtual	B-Application
PC	I-Application
5	O
in	O
Mac	B-Application
OS	I-Application
X	I-Application
,	O
a	O
400MHz	O
or	O
faster	O
processor	B-Device
is	O
required	O
.	O
</s>
<s>
Earlier	O
versions	O
of	O
Virtual	B-Application
PC	I-Application
supported	O
the	O
following	O
features	O
:	O
(	O
now	O
removed	O
in	O
Microsoft	B-Application
Virtual	I-Application
PC	I-Application
2004	O
,	O
2007	O
,	O
and	O
Windows	B-Application
Virtual	I-Application
PC	I-Application
)	O
:	O
</s>
<s>
Older	O
versions	O
of	O
Virtual	B-Application
PC	I-Application
(	O
v5.0	O
or	O
earlier	O
)	O
may	O
have	O
the	O
hard	O
disk	B-Device
formatted	O
after	O
creating	O
the	O
Virtual	O
Hard	O
Disk	B-Device
file	O
.	O
</s>
<s>
Newer	O
versions	O
must	O
partition	B-Application
and	O
format	O
the	O
Virtual	O
Hard	O
Disk	B-Device
file	O
manually	O
.	O
</s>
<s>
A	O
Virtual	O
Switch	O
available	O
in	O
Virtual	B-Application
PC	I-Application
version	O
4.1	O
or	O
earlier	O
allows	O
adding	O
multiple	O
network	B-Architecture
adapters	O
.	O
</s>
<s>
Older	O
operating	O
systems	O
are	O
supported	O
with	O
Virtual	B-Architecture
Machine	I-Architecture
additions	O
.	O
</s>
<s>
Older	O
versions	O
of	O
Virtual	B-Application
PC	I-Application
for	O
Macintosh	B-Device
can	O
run	O
on	O
Mac	B-Operating_System
OS	I-Operating_System
9.2.2	I-Operating_System
or	O
earlier	O
.	O
</s>
<s>
Under	O
agreement	O
with	O
Connectix	O
,	O
Innotek	B-Operating_System
GmbH	I-Operating_System
(	O
makers	O
of	O
VirtualBox	B-Operating_System
,	O
now	O
part	O
of	O
Oracle	B-Application
)	O
ported	O
version	O
5.0	O
to	O
run	O
on	O
an	O
OS/2	B-Application
host	O
.	O
</s>
<s>
This	O
version	O
also	O
included	O
guest	O
extensions	O
(	O
VM	O
additions	O
)	O
for	O
OS/2	B-Application
guests	O
,	O
which	O
could	O
run	O
on	O
Windows	O
,	O
OS/2	B-Application
or	O
Mac	B-Application
OS	I-Application
X	I-Application
hosts	O
using	O
Virtual	B-Application
PC	I-Application
versions	O
5	O
,	O
6	O
or	O
7	O
.	O
</s>
<s>
A	O
new	O
version	O
of	O
the	O
guest	O
extensions	O
was	O
later	O
included	O
with	O
Microsoft	O
's	O
Virtual	B-Application
PC	I-Application
2004	I-Application
.	O
</s>
<s>
On	O
July	O
12	O
,	O
2006	O
,	O
Microsoft	O
released	O
Virtual	B-Application
PC	I-Application
2004	I-Application
SP1	O
for	O
Windows	O
free	O
of	O
charge	O
,	O
but	O
the	O
Mac	B-Device
version	O
remained	O
a	O
paid	O
software	O
.	O
</s>
<s>
The	O
equivalent	O
version	O
for	O
Mac	B-Device
,	O
version	O
7	O
,	O
was	O
the	O
final	O
version	O
of	O
Virtual	B-Application
PC	I-Application
for	I-Application
Mac	I-Application
.	O
</s>
<s>
It	O
ran	O
on	O
Mac	B-Application
OS	I-Application
X	I-Application
10.2.8	O
or	O
later	O
for	O
PowerPC	B-Architecture
and	O
was	O
a	O
proprietary	B-Application
commercial	B-Application
software	I-Application
product	O
.	O
</s>
<s>
Virtual	B-Application
PC	I-Application
2007	I-Application
was	O
released	O
only	O
for	O
the	O
Windows	O
platform	O
,	O
with	O
public	O
beta	O
testing	O
beginning	O
October	O
11	O
,	O
2006	O
,	O
and	O
production	O
release	O
on	O
February	O
19	O
,	O
2007	O
.	O
</s>
<s>
It	O
added	O
support	O
for	O
hardware	B-General_Concept
virtualization	I-General_Concept
,	O
"	O
undo	O
disks	B-Device
"	O
,	O
transfer	O
statistic	O
monitor	O
for	O
disk	B-Device
and	O
network	B-Architecture
,	O
and	O
viewing	O
virtual	B-Architecture
machines	I-Architecture
on	O
multiple	O
monitors	O
and	O
support	O
for	O
Windows	O
Vista	O
as	O
both	O
host	O
and	O
guest	O
.	O
</s>
<s>
The	O
Windows	O
Aero	O
interface	O
is	O
disabled	O
on	O
Windows	O
Vista	O
guests	O
due	O
to	O
limitations	O
of	O
the	O
emulated	B-Application
video	O
hardware	O
;	O
however	O
,	O
Aero	O
effects	O
can	O
be	O
rendered	O
by	O
connecting	O
to	O
the	O
guest	O
via	O
Remote	B-Protocol
Desktop	I-Protocol
Services	I-Protocol
from	O
an	O
Aero-enabled	O
Windows	O
Vista	O
host	O
,	O
provided	O
that	O
the	O
guest	O
is	O
running	O
Windows	O
Vista	O
Business	O
or	O
a	O
higher	O
edition	O
.	O
</s>
<s>
"	O
Undo	O
disks	B-Device
"	O
make	O
it	O
possible	O
to	O
revert	O
virtual	B-Architecture
machines	I-Architecture
 '	O
state	O
to	O
an	O
earlier	O
point	O
by	O
storing	O
changes	O
into	O
a	O
separate	O
.vud	O
file	O
since	O
the	O
last	O
save	O
to	O
the	O
main	O
.vhd	O
file	O
,	O
which	O
can	O
be	O
used	O
for	O
experimenting	O
.	O
</s>
<s>
The	O
VHD	O
file	O
acts	O
as	O
a	O
snapshot	B-Application
.	O
</s>
<s>
The	O
undo	O
disk	B-Device
file	O
(	O
.vud	O
)	O
incrementally	O
stores	O
changes	O
made	O
by	O
the	O
virtual	B-Architecture
machine	I-Architecture
compared	O
to	O
the	O
main	O
Virtual	B-Application
hard	I-Application
disk	I-Application
drive	I-Application
(	O
VHD	O
)	O
image	O
,	O
which	O
can	O
be	O
applied	O
or	O
discarded	O
by	O
the	O
user	O
.	O
</s>
<s>
On	O
May	O
15	O
,	O
2008	O
,	O
Microsoft	O
released	O
Virtual	B-Application
PC	I-Application
2007	I-Application
Service	O
Pack	O
1	O
,	O
which	O
added	O
support	O
for	O
both	O
Windows	B-Application
XP	I-Application
SP3	O
and	O
Windows	O
Vista	O
SP1	O
as	O
guest	O
and	O
host	O
OSes	O
,	O
as	O
well	O
as	O
Windows	B-Device
Server	I-Device
2008	I-Device
Standard	I-Device
as	O
a	O
guest	O
OS	O
.	O
</s>
<s>
A	O
hotfix	O
rollup	O
for	O
Virtual	B-Application
PC	I-Application
2007	I-Application
SP1	O
,	O
released	O
February	O
20	O
,	O
2009	O
,	O
solved	O
networking	O
issues	O
and	O
enhanced	O
the	O
maximum	O
screen	O
resolution	O
to	O
2048×1920	O
(	O
32-bit	O
)	O
,	O
enabling	O
16:9	O
resolutions	O
such	O
as	O
1920×1080	O
.	O
</s>
<s>
A	O
security	O
update	O
was	O
released	O
on	O
July	O
14	O
,	O
2009	O
to	O
address	O
an	O
elevation	O
of	O
privilege	O
vulnerability	O
in	O
guest	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
Microsoft	B-Application
Virtual	I-Application
PC	I-Application
(	O
2004	O
and	O
2007	O
)	O
does	O
not	O
work	O
at	O
all	O
on	O
Windows	B-Operating_System
10	I-Operating_System
64-bit	O
,	O
and	O
even	O
on	O
32-bit	O
platforms	O
lack	O
internet	O
connectivity	O
due	O
to	O
the	O
lack	O
of	O
the	O
VPC	O
driver	O
.	O
</s>
<s>
This	O
also	O
impacts	O
Windows	O
Mobile	O
emulators	B-Application
.	O
</s>
<s>
Windows	B-Application
Virtual	I-Application
PC	I-Application
entered	O
public	O
beta	O
testing	O
on	O
April	O
30	O
,	O
2009	O
,	O
and	O
was	O
released	O
alongside	O
Windows	B-Device
7	I-Device
.	O
</s>
<s>
Unlike	O
its	O
predecessors	O
,	O
this	O
version	O
supports	O
only	O
Windows	B-Device
7	I-Device
host	O
operating	O
systems	O
.	O
</s>
<s>
It	O
originally	O
required	O
hardware	B-General_Concept
virtualization	I-General_Concept
support	O
but	O
on	O
March	O
19	O
,	O
2010	O
,	O
Microsoft	O
released	O
an	O
update	O
to	O
Microsoft	B-Application
Virtual	I-Application
PC	I-Application
which	O
allows	O
it	O
to	O
run	O
on	O
PCs	O
without	O
hardware	O
support	O
.	O
</s>
<s>
Windows	B-Application
Virtual	I-Application
PC	I-Application
is	O
available	O
free	O
of	O
charge	O
for	O
certain	O
editions	O
of	O
Windows	B-Device
7	I-Device
,	O
either	O
pre-installed	O
by	O
OEMs	O
or	O
via	O
download	O
from	O
the	O
Microsoft	O
website	O
.	O
</s>
<s>
The	O
Virtual	B-Architecture
Machine	I-Architecture
console	O
is	O
replaced	O
by	O
an	O
integrated	O
Virtual	B-Architecture
Machines	I-Architecture
shell	O
folder	O
.	O
</s>
<s>
Several	O
options	O
from	O
the	O
console	O
have	O
been	O
removed	O
such	O
as	O
Restore	O
at	O
start	O
,	O
CPU	B-Device
time	O
performance	O
settings	O
,	O
muting	O
sound	O
in	O
inactive	O
virtual	B-Architecture
machines	I-Architecture
,	O
full-screen	O
resolution	O
related	O
options	O
,	O
configuring	O
the	O
host	O
key	O
,	O
mouse	O
capture	O
options	O
and	O
settings	O
for	O
requiring	O
administrator	O
permissions	O
.	O
</s>
<s>
Virtual	B-Application
PC	I-Application
additions	O
for	O
guest	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
no	O
longer	O
supported	O
have	O
been	O
removed	O
.	O
</s>
<s>
However	O
,	O
installing	O
Virtual	B-Architecture
Machine	I-Architecture
Additions	O
from	O
an	O
older	O
Microsoft	O
virtualization	B-General_Concept
product	O
works	O
for	O
some	O
guest	O
OSes	O
.	O
</s>
<s>
Properties	O
of	O
the	O
virtual	B-Architecture
machine	I-Architecture
,	O
like	O
guest	O
OS	O
,	O
processor	B-Device
,	O
processor	B-Device
features	O
,	O
video	O
mode	O
,	O
video	O
RAM	O
,	O
code	O
cache	O
,	O
IDE	O
controller	O
reads	O
and	O
writes	O
,	O
Ethernet	O
reads	O
and	O
writes	O
,	O
video	O
frame	O
rate	O
and	O
command	O
line	O
options	O
can	O
no	O
longer	O
be	O
viewed	O
.	O
</s>
<s>
System	O
requirements	O
for	O
Windows	B-Application
Virtual	I-Application
PC	I-Application
:	O
</s>
<s>
Optional	O
:	O
if	O
the	O
processor	B-Device
supports	O
hardware-assisted	O
virtualization	B-General_Concept
technology	I-General_Concept
such	O
as	O
AMD-V	O
or	O
Intel-VT	O
,	O
it	O
will	O
be	O
used	O
.	O
</s>
<s>
Before	O
March	O
19	O
,	O
2010	O
,	O
such	O
a	O
processor	B-Device
was	O
mandatory	O
.	O
</s>
<s>
Windows	B-Application
XP	I-Application
Mode	O
(	O
XPM	O
)	O
is	O
a	O
virtual	B-Architecture
machine	I-Architecture
package	O
for	O
Windows	B-Application
Virtual	I-Application
PC	I-Application
containing	O
a	O
pre-installed	O
,	O
licensed	O
copy	O
of	O
Windows	B-Application
XP	I-Application
Professional	O
with	O
Service	O
Pack	O
3	O
as	O
its	O
guest	O
OS	O
.	O
</s>
<s>
Previously	O
,	O
both	O
the	O
CPU	B-Device
and	O
motherboard	O
of	O
the	O
host	O
had	O
to	O
support	O
hardware	B-General_Concept
virtualization	I-General_Concept
,	O
but	O
an	O
update	O
in	O
early	O
2010	O
eliminated	O
this	O
requirement	O
.	O
</s>
<s>
Pre-installed	O
integration	O
components	O
allow	O
applications	O
running	O
within	O
the	O
virtualized	O
environment	O
to	O
appear	O
as	O
if	O
running	O
directly	O
on	O
the	O
host	O
,	O
sharing	O
the	O
native	O
desktop	O
and	O
start	O
menu	O
of	O
Windows	B-Device
7	I-Device
as	O
well	O
as	O
participating	O
in	O
file	O
type	O
associations	O
.	O
</s>
<s>
Windows	B-Application
XP	I-Application
Mode	O
applications	O
run	O
in	O
a	O
Terminal	B-Protocol
Services	I-Protocol
session	O
in	O
the	O
virtualized	O
Windows	B-Application
XP	I-Application
,	O
and	O
are	O
accessed	O
via	O
Remote	B-Protocol
Desktop	I-Protocol
Protocol	I-Protocol
by	O
a	O
client	O
running	O
on	O
the	O
Windows	B-Device
7	I-Device
host	O
.	O
</s>
<s>
Applications	O
running	O
in	O
Windows	B-Application
XP	I-Application
Mode	O
do	O
not	O
have	O
compatibility	O
issues	O
,	O
as	O
they	O
are	O
actually	O
running	O
inside	O
a	O
Windows	B-Application
XP	I-Application
virtual	B-Architecture
machine	I-Architecture
and	O
redirected	O
using	O
RDP	O
to	O
the	O
Windows	B-Device
7	I-Device
host	O
.	O
</s>
<s>
Windows	B-Application
XP	I-Application
Mode	O
may	O
be	O
used	O
to	O
run	O
16-bit	O
applications	O
;	O
it	O
includes	O
NTVDM	O
,	O
although	O
it	O
might	O
be	O
impossible	O
to	O
run	O
16-bit	O
applications	O
that	O
require	O
hardware	O
acceleration	O
,	O
as	O
Windows	B-Application
Virtual	I-Application
PC	I-Application
does	O
not	O
have	O
hardware	O
acceleration	O
.	O
</s>
<s>
Windows	B-Application
XP	I-Application
Mode	O
is	O
available	O
free	O
of	O
charge	O
to	O
users	O
of	O
Windows	B-Device
7	I-Device
Professional	O
,	O
Enterprise	O
,	O
and	O
Ultimate	O
.	O
</s>
<s>
Users	O
of	O
other	O
editions	O
of	O
Windows	B-Device
7	I-Device
are	O
not	O
eligible	O
to	O
download	O
and	O
use	O
it	O
.	O
</s>
<s>
This	O
restriction	O
does	O
not	O
apply	O
to	O
Windows	B-Application
Virtual	I-Application
PC	I-Application
itself	O
.	O
</s>
<s>
Windows	B-Application
XP	I-Application
Mode	O
can	O
also	O
be	O
run	O
with	O
the	O
VMware	B-Operating_System
Player	I-Operating_System
and	O
VMware	B-Operating_System
Workstation	I-Operating_System
.	O
</s>
<s>
However	O
,	O
like	O
Virtual	B-Application
PC	I-Application
itself	O
,	O
VMware	O
products	O
only	O
import	O
Windows	B-Application
XP	I-Application
Mode	O
on	O
Windows	B-Device
7	I-Device
Professional	O
,	O
Enterprise	O
,	O
or	O
Ultimate	O
to	O
adhere	O
with	O
Microsoft	O
licensing	O
requirements	O
.	O
</s>
<s>
Virtual	B-Application
PC	I-Application
emulates	B-Application
the	O
following	O
environments	O
:	O
</s>
<s>
Intel	B-General_Concept
Pentium	I-General_Concept
II	I-General_Concept
(	O
32-bit	O
)	O
processor	B-Device
(	O
but	O
virtualizes	O
the	O
host	O
processor	B-Device
on	O
Windows	O
versions	O
)	O
with	O
an	O
Intel	B-Device
440BX	I-Device
chipset	O
.	O
</s>
<s>
Standard	O
SVGA	O
VESA	O
graphics	B-Device
card	I-Device
(	O
S3	B-Device
Trio	I-Device
32	O
PCI	B-Protocol
with	O
4	O
MB	O
video	O
RAM	O
,	O
adjustable	O
in	O
later	O
versions	O
up	O
to	O
16MB	O
by	O
manually	O
editing	O
a	O
virtual	B-Architecture
machine	I-Architecture
's	O
settings	O
file	O
)	O
.	O
</s>
<s>
System	B-Operating_System
BIOS	I-Operating_System
from	O
American	O
Megatrends	O
(	O
AMI	O
)	O
.	O
</s>
<s>
Creative	O
Labs	O
Sound	B-Application
Blaster	I-Application
16	O
ISA	B-Architecture
PnP	B-Device
.	O
</s>
<s>
DEC	O
21041	O
(	O
DEC	O
21140	O
in	O
newer	O
versions	O
)	O
Ethernet	O
network	B-Architecture
card	O
.	O
</s>
<s>
Programs	O
using	O
undocumented	O
features	O
of	O
hardware	O
,	O
exotic	O
timings	O
,	O
or	O
unsupported	O
opcodes	B-Language
may	O
not	O
work	O
.	O
</s>
<s>
The	O
Macintosh	B-Device
version	O
of	O
Virtual	B-Application
PC	I-Application
uses	O
dynamic	O
recompilation	O
to	O
translate	O
the	O
x86	B-Operating_System
code	O
used	O
by	O
PCs	O
into	O
equivalent	O
PowerPC	B-Architecture
code	O
for	O
Macs	B-Device
.	O
</s>
<s>
The	O
Windows	O
version	O
of	O
Virtual	B-Application
PC	I-Application
also	O
uses	O
dynamic	O
recompilation	O
,	O
but	O
only	O
to	O
translate	O
x86	B-Operating_System
kernel	O
mode	O
and	O
real	B-Application
mode	I-Application
code	O
into	O
x86	B-Operating_System
user	B-Operating_System
mode	I-Operating_System
code	O
;	O
original	O
user	B-Operating_System
mode	I-Operating_System
and	O
virtual	B-Application
8086	I-Application
mode	I-Application
code	O
run	O
natively	O
.	O
</s>
<s>
Guest	O
call	O
traps	O
are	O
used	O
,	O
especially	O
for	O
guest	O
extensions	O
,	O
to	O
accelerate	O
emulation	B-Application
or	O
offer	O
additional	O
features	O
,	O
such	O
as	O
integration	O
with	O
the	O
host	O
environment	O
.	O
</s>
<s>
Virtual	B-Application
PC	I-Application
and	O
Virtual	B-General_Concept
Server	I-General_Concept
encapsulate	O
virtual	O
hard	O
disks	B-Device
in	O
the	O
Virtual	O
Hard	O
Disk	B-Device
(	O
VHD	O
)	O
file	O
format	O
,	O
for	O
which	O
Microsoft	O
has	O
made	O
all	O
documentation	O
available	O
under	O
the	O
Open	O
Specification	O
Promise	O
.	O
</s>
<s>
Earlier	O
versions	O
of	O
Virtual	B-Application
PC	I-Application
supported	O
the	O
following	O
features	O
:	O
(	O
now	O
removed	O
in	O
Microsoft	B-Application
Virtual	I-Application
PC	I-Application
2004	O
,	O
2007	O
,	O
and	O
Windows	B-Application
Virtual	I-Application
PC	I-Application
)	O
:	O
</s>
<s>
Older	O
versions	O
of	O
Virtual	B-Application
PC	I-Application
(	O
v5.0	O
or	O
earlier	O
)	O
may	O
have	O
the	O
hard	O
disk	B-Device
formatted	O
after	O
creating	O
the	O
Virtual	O
Hard	O
Disk	B-Device
file	O
.	O
</s>
<s>
Newer	O
versions	O
must	O
partition	B-Application
and	O
format	O
the	O
Virtual	O
Hard	O
Disk	B-Device
file	O
manually	O
.	O
</s>
<s>
A	O
Virtual	O
Switch	O
available	O
in	O
Virtual	B-Application
PC	I-Application
version	O
4.1	O
or	O
earlier	O
allows	O
adding	O
multiple	O
network	B-Architecture
adapters	O
.	O
</s>
<s>
Older	O
operating	O
systems	O
are	O
supported	O
with	O
Virtual	B-Architecture
Machine	I-Architecture
additions	O
.	O
</s>
<s>
Older	O
versions	O
of	O
Virtual	B-Application
PC	I-Application
for	O
Macintosh	B-Device
can	O
run	O
on	O
Mac	B-Operating_System
OS	I-Operating_System
9.2.2	I-Operating_System
or	O
earlier	O
.	O
</s>
<s>
Windows	B-Application
Virtual	I-Application
PC	I-Application
may	O
enable	O
guest	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
running	O
inside	O
virtual	B-Architecture
machines	I-Architecture
to	O
interact	O
with	O
their	O
host	O
operating	O
system	O
beyond	O
what	O
is	O
feasible	O
between	O
two	O
physical	O
computers	O
,	O
such	O
as	O
sharing	O
physical	O
hardware	O
components	O
or	O
exchanging	O
data	O
.	O
</s>
<s>
To	O
do	O
so	O
however	O
,	O
integration	O
components	O
must	O
be	O
installed	O
on	O
the	O
guest	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
When	O
no	O
integration	O
component	O
is	O
installed	O
,	O
the	O
only	O
mean	O
of	O
communicating	O
between	O
two	O
machines	O
(	O
either	O
virtual	O
or	O
physical	O
)	O
is	O
through	O
a	O
virtual	O
network	B-Architecture
interface	O
.	O
</s>
<s>
However	O
,	O
once	O
the	O
Integration	O
Components	O
are	O
installed	O
on	O
the	O
guest	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
,	O
the	O
following	O
features	O
are	O
automatically	O
activated	O
:	O
</s>
<s>
Host-initiated	O
shutdown	O
:	O
Virtual	B-Architecture
machine	I-Architecture
can	O
be	O
shut	O
down	O
,	O
restarted	O
or	O
put	O
into	O
standby	O
or	O
hibernation	O
via	O
a	O
set	O
of	O
API	B-Application
functions	I-Application
.	O
</s>
<s>
Time	O
synchronization	O
:	O
The	O
virtual	B-Architecture
machine	I-Architecture
's	O
clock	O
will	O
be	O
automatically	O
synchronized	O
with	O
the	O
host	O
operating	O
system	O
's	O
clock	O
.	O
</s>
<s>
Process	O
responsiveness	O
monitoring	O
:	O
Host	O
operating	O
system	O
will	O
be	O
able	O
to	O
detect	O
whether	O
the	O
software	O
on	O
the	O
guest	B-General_Concept
operating	I-General_Concept
system	I-General_Concept
is	O
responsive	O
or	O
hung	O
.	O
</s>
<s>
Dynamic	O
screen	O
resolution	O
:	O
The	O
screen	O
resolution	O
of	O
the	O
guest	B-General_Concept
operating	I-General_Concept
system	I-General_Concept
can	O
be	O
changed	O
by	O
simply	O
resizing	O
the	O
window	O
in	O
which	O
it	O
is	O
running	O
.	O
</s>
<s>
In	O
addition	O
to	O
features	O
described	O
above	O
,	O
guest	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
may	O
also	O
take	O
advantage	O
of	O
the	O
following	O
integration	O
features	O
but	O
only	O
when	O
the	O
administrator	O
activates	O
them	O
:	O
</s>
<s>
Audio	O
sharing	O
:	O
Audio	O
played	O
on	O
the	O
guest	B-General_Concept
operating	I-General_Concept
system	I-General_Concept
may	O
be	O
brought	O
to	O
the	O
host	O
operating	O
system	O
and	O
played	O
on	O
it	O
.	O
</s>
<s>
Printer	O
sharing	O
:	O
Guest	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
may	O
print	O
on	O
the	O
host	O
operating	O
system	O
's	O
printer	O
.	O
</s>
<s>
This	O
feature	O
should	O
not	O
be	O
confused	O
with	O
File	O
and	O
Printer	O
Sharing	O
over	O
an	O
emulated	B-Application
network	B-Architecture
connection	O
.	O
</s>
<s>
Smart	O
card	O
sharing	O
:	O
Smart	O
cards	O
connected	O
to	O
host	O
operating	O
system	O
may	O
be	O
accessed	O
on	O
guest	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
File	O
sharing	O
:	O
Windows	B-Application
Virtual	I-Application
PC	I-Application
can	O
also	O
share	O
disk	B-Application
partitions	I-Application
and	O
disk	B-Device
drives	I-Device
of	O
the	O
host	O
operating	O
system	O
with	O
guest	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
In	O
Windows	B-Application
Virtual	I-Application
PC	I-Application
,	O
enabling	O
integration	O
features	O
automatically	O
makes	O
the	O
virtual	B-Architecture
machine	I-Architecture
user	O
account	O
accessible	O
using	O
Remote	B-Protocol
Desktop	I-Protocol
Connection	I-Protocol
.	O
</s>
<s>
Virtual	B-Application
PC	I-Application
allows	O
multiple	O
guest	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
to	O
run	O
virtualized	O
on	O
a	O
single	O
physical	O
host	O
.	O
</s>
<s>
Although	O
a	O
number	O
of	O
popular	O
host	O
and	O
guest	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
lack	O
official	O
Microsoft	O
support	O
,	O
there	O
are	O
sometimes	O
few	O
,	O
if	O
any	O
,	O
technical	O
obstacles	O
impeding	O
installation	O
.	O
</s>
<s>
Instead	O
,	O
a	O
configuration	O
may	O
be	O
unsupported	O
due	O
to	O
Microsoft	O
's	O
own	O
licensing	O
restrictions	O
,	O
or	O
a	O
decision	O
to	O
focus	O
testing	O
and	O
support	O
resources	O
elsewhere	O
,	O
especially	O
when	O
production	O
use	O
of	O
a	O
legacy	B-Device
product	I-Device
fades	O
.	O
</s>
<s>
A	O
program	O
manager	O
on	O
Microsoft	O
's	O
core	O
virtualization	B-General_Concept
team	O
explains	O
what	O
official	O
support	O
entails	O
:	O
</s>
<s>
As	O
a	O
product	O
positioned	O
for	O
desktop	O
use	O
,	O
Virtual	B-Application
PC	I-Application
provides	O
official	O
support	O
for	O
a	O
different	O
set	O
of	O
operating	O
systems	O
than	O
its	O
server-oriented	O
counterpart	O
,	O
Microsoft	B-General_Concept
Virtual	I-General_Concept
Server	I-General_Concept
and	O
the	O
more	O
advanced	O
Hyper-V	O
.	O
</s>
<s>
While	O
the	O
latter	O
products	O
support	O
a	O
range	O
of	O
server	O
operating	O
systems	O
,	O
Virtual	B-Application
PC	I-Application
2007	I-Application
supports	O
only	O
one	O
variety	O
as	O
host	O
and	O
another	O
as	O
guest	O
;	O
its	O
successor	O
,	O
Windows	B-Application
Virtual	I-Application
PC	I-Application
,	O
supports	O
none	O
.	O
</s>
<s>
And	O
,	O
whereas	O
Virtual	B-General_Concept
Server	I-General_Concept
and	O
Hyper-V	O
have	O
officially	O
supported	O
select	O
Linux	B-Application
guests	O
since	O
2006	O
and	O
2008	O
,	O
respectively	O
,	O
,	O
no	O
Microsoft	O
release	O
of	O
Virtual	B-Application
PC	I-Application
has	O
officially	O
supported	O
Linux	B-Application
.	O
</s>
<s>
Nonetheless	O
,	O
a	O
number	O
of	O
Linux	B-Application
distributions	I-Application
do	O
run	O
successfully	O
in	O
Virtual	B-Application
PC	I-Application
2007	I-Application
,	O
and	O
can	O
be	O
used	O
with	O
the	O
Virtual	B-Architecture
Machine	I-Architecture
Additions	O
from	O
Virtual	B-General_Concept
Server	I-General_Concept
(	O
see	O
below	O
)	O
.	O
</s>
<s>
Lastly	O
,	O
while	O
64-bit	O
host	O
support	O
was	O
introduced	O
with	O
Virtual	B-Application
PC	I-Application
2007	I-Application
,	O
release	O
has	O
been	O
able	O
to	O
virtualize	O
a	O
64-bit	O
guest	O
;	O
Microsoft	O
has	O
thus	O
far	O
reserved	O
this	O
functionality	O
for	O
Hyper-V	O
,	O
which	O
runs	O
only	O
on	O
64-bit	O
(	O
x64	O
)	O
editions	O
of	O
Windows	B-Device
Server	I-Device
2008	I-Device
,	O
Windows	B-Device
Server	I-Device
2012	I-Device
,	O
Windows	B-Device
Server	I-Device
2012	I-Device
R2	O
,	O
Windows	B-Device
Server	I-Device
2016	I-Device
,	O
Windows	O
8/8.1	O
Pro	O
and	O
Enterprise	O
,	O
and	O
Windows	B-Operating_System
10	I-Operating_System
Pro	O
,	O
Enterprise	O
,	O
and	O
Education	O
.	O
</s>
<s>
Operating	O
system	O
version	O
Virtual	B-Application
PC	I-Application
2004	I-Application
See	O
also	O
download	O
details	O
.	O
</s>
<s>
Virtual	B-Application
PC	I-Application
2007	I-Application
See	O
also	O
download	O
details	O
.	O
</s>
<s>
Windows	B-Application
Virtual	I-Application
PC	I-Application
See	O
also	O
download	O
details	O
.	O
</s>
<s>
Host	O
Guest	O
Host	O
Guest	O
Host	O
Guest	O
32-bit	O
64-bit	O
32-bit	O
32-bit	O
64-bit	O
32-bit	O
32-bit	O
64-bit	O
32-bit	B-Application
Windows	I-Application
11	O
No	O
No	O
No	O
Windows	B-Operating_System
10	I-Operating_System
No	O
Windows	B-Device
8.1	I-Device
No	O
Windows	B-Application
8	I-Application
Windows	B-Device
7	I-Device
Ultimate	O
No	O
No	O
No	O
No	O
Windows	B-Device
7	I-Device
Enterprise	O
No	O
No	O
No	O
Windows	B-Device
7	I-Device
Professional	O
No	O
No	O
No	O
Windows	B-Device
7	I-Device
Home	O
Premium	O
No	O
No	O
No	O
Windows	B-Device
7	I-Device
Home	O
Basic	O
No	O
No	O
No	O
Windows	B-Device
7	I-Device
Starter	O
No	O
No	O
No	O
No	O
No	O
No	O
Windows	B-Device
Server	I-Device
2008	I-Device
Standard	I-Device
No	O
No	O
No	O
No	O
No	O
No	O
No	O
No	O
Windows	O
Vista	O
UltimateNo	O
No	O
Windows	O
Vista	O
Enterprise	O
Windows	O
Vista	O
Business	O
Windows	O
Vista	O
Home	O
Premium	O
No	O
Windows	O
Vista	O
Home	O
Basic	O
No	O
Windows	O
Vista	O
Starter	O
No	O
No	O
No	O
No	O
No	O
Windows	O
Server	O
2003	O
Standard	O
No	O
No	O
No	O
No	O
Windows	B-Application
XP	I-Application
Professional	O
No	O
No	O
No	O
Windows	B-Application
XP	I-Application
Tablet	O
PC	O
Edition	O
No	O
Windows	B-Application
XP	I-Application
Media	I-Application
Center	I-Application
Edition	I-Application
No	O
No	O
No	O
No	O
No	O
Windows	B-Application
XP	I-Application
Home	O
Edition	O
No	O
No	O
Windows	B-Application
XP	I-Application
Starter	O
Edition	O
No	O
No	O
No	O
Windows	B-Application
2000	I-Application
Server	O
No	O
rowspan	O
=	O
"	O
2	O
"	O
No	O
rowspan	O
=	O
"	O
2	O
"	O
No	O
rowspan	O
=	O
"	O
2	O
"	O
No	O
Windows	B-Application
2000	I-Application
Professional	O
No	O
No	O
No	O
Windows	B-Device
Me	I-Device
No	O
No	O
No	O
No	O
No	O
Windows	B-Device
98	I-Device
Second	O
Edition	O
No	O
rowspan	O
=	O
"	O
2	O
"	O
No	O
rowspan	O
=	O
"	O
2	O
"	O
No	O
rowspan	O
=	O
"	O
2	O
"	O
No	O
Windows	B-Device
98	I-Device
(	O
original	O
release	O
)	O
No	O
Windows	B-Application
95	I-Application
No	O
No	O
No	O
No	O
No	O
Windows	O
NT	O
4.0	O
Workstation	O
No	O
rowspan	O
="3	O
"	O
No	O
rowspan	O
="3	O
"	O
No	O
No	O
rowspan	O
="3	O
"	O
No	O
Windows	B-Device
NT	I-Device
3.51	I-Device
Workstation	I-Device
No	O
No	O
Windows	B-Device
NT	I-Device
3.1	I-Device
|	O
NT	B-Device
3.5	I-Device
No	O
No	O
IBM	B-Application
OS/2	I-Application
(	O
select	O
editions	O
)	O
No	O
No	O
No	O
No	O
Operating	O
system	O
version	O
16-bit	O
Windows	B-Application
3.1	I-Application
No	O
No	O
(	O
Microsoft	O
manager	O
Ben	O
Armstrong	O
reports	O
that	O
Windows	O
3.11	O
installs	O
without	O
a	O
problem	O
in	O
Virtual	B-Application
PC	I-Application
2004	I-Application
.	O
)	O
</s>
<s>
Installing	O
a	O
Linux-based	O
guest	O
environment	O
in	O
Virtual	B-Application
PC	I-Application
is	O
possible	O
.	O
</s>
<s>
RedHat	O
and	O
SuSe	O
Linux	B-Application
guests	O
are	O
supported	O
.	O
</s>
<s>
Linux	B-Application
additions	O
are	O
supported	O
in	O
Microsoft	B-General_Concept
Virtual	I-General_Concept
Server	I-General_Concept
,	O
and	O
these	O
additions	O
should	O
also	O
work	O
in	O
Virtual	B-Application
PC	I-Application
.	O
</s>
<s>
Some	O
Linux	B-Application
distributions	I-Application
must	O
be	O
installed	O
in	O
text	O
mode	O
,	O
as	O
they	O
do	O
not	O
support	O
Microsoft	B-Application
Virtual	I-Application
PC	I-Application
's	O
emulated	B-Application
graphics	O
chip	O
.	O
</s>
<s>
Some	O
websites	O
specialize	O
in	O
listing	O
operating	O
systems	O
that	O
run	O
successfully	O
as	O
Virtual	B-Application
PC	I-Application
guests	O
,	O
to	O
help	O
users	O
avoid	O
issues	O
when	O
installing	O
Linux	B-Application
distributions	I-Application
or	O
other	O
operating	O
systems	O
lacking	O
official	O
Microsoft	O
support	O
.	O
</s>
<s>
Microsoft	O
announced	O
on	O
August	O
7	O
,	O
2006	O
,	O
that	O
Virtual	B-Application
PC	I-Application
for	I-Application
Mac	I-Application
would	O
not	O
be	O
ported	O
to	O
the	O
Intel	B-Device
Mac	I-Device
platform	O
.	O
</s>
<s>
Similar	O
products	O
available	O
or	O
announced	O
at	O
the	O
time	O
were	O
Parallels	B-Language
Desktop	I-Language
and	O
VMware	B-Operating_System
Fusion	I-Operating_System
.	O
</s>
